Toys that you can put in the freezer and get some ABA therapy and talk to your speech therapist about things than be be safe to replace his need to chew on things.

Try www.smartmoms.com teething bling is also availible on amazon. Another good choice for chewable toys/fidgets is www.kidcompanions.com

It could be behavior-related, in which case using analyzing the behavior might help (look for info on autism and ABC chart) or it might be sensory-related, in which case an OT might help. Or maybe it's both. Either way, it's certainly something you have to address.

Thank you for all of your responses. My first attempt was to type 'biting' into the search box and didn't come up w/much. I'll check again and you certainly are right - this needs to be addressed. Many thanks.